Browning, Norma Lee. The psychic world of Peter Hurkos. - [1st ed.] - Garden City, N.Y. Doubleday 1970. - 255 p. illus., ports. 22 cm. LCCN: 76114751 Subjects--Personal Names: Van der Hurk, Pieter 1911- LC Class. No.: BF1027.V3 / B7 Dewey Class. No.: 133.8/0924